"LEARN ASTROLOGY - EFFECTS OF EXCHANGE OF HOUSES/ASTERISMS" The situation, in which a planet ‘A’ is placed in a sign or nakshatra ruled by the planet ‘B’ and the planet ‘B’ is placed in a sign or nakshatra ruled by the planet ‘A’, is considered as exchange of houses or exchange of nakshatra (asterisms). For example, if the Sun is placed in the sign Scorpio and the planet Mars is placed in the sign, Leo, then the classical works considers this as exchange of houses by the Sun and Mars. Under the Systems' Approach, we do not recognize this concept. Each planet is considered, separately, for its placement, strength, relationship with other planets, etc.
